Semiconductor package and method for manufacturing the same

ABSTRACT

A semiconductor package includes a semiconductor chip, a first substrate layer and a second substrate layer. The semiconductor chip has an active surface and a plurality of pads disposed on the active surface. The first substrate layer is formed on the active surface of the semiconductor chip and has a plurality of first contacts electrically connected to the pads of the semiconductor chip. The second substrate layer is substantially smaller than the first substrate layer, is formed on the first substrate layer, and has a plurality of second contacts electrically connected to the first contacts of the first substrate layer.

This application claims the priority benefit of Taiwan Patent Application Serial Number 093102846, filed Feb. 6, 2004, the full disclosure of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to a semiconductor package, and more particularly to a wafer level semiconductor package including substrate layer with higher packaging density of an integrated circuit.

2. Description of the Related Art

High efficiency, low cost, minimization and higher packaging density of a semiconductor package are objects that most electronic companies continuously attempt to achieve. The above-mentioned semiconductor packages are Multiple Chip Module/Stack/Ball Grid Array (MCM/Stack/BGA), Cavity Down Ball Grid Array (Cavity Down BGA), Flip Chip Ball Grid Array (Flip Chip BGA), Flip Chip Pin Grid Array (Flip Chip PGA) and Ball Grid Array which have active components and passive components.

However, the above-mention semiconductor packages generally include a substrate for supporting a semiconductor chip or for acting as an intermediate carrier between the semiconductor chip and a printed circuit board. Furthermore, the passive components are disposed in an extra space and on an extra area.

Referring FIG. 1, a conventional Chip Size Package (CSP) 2 includes a semiconductor chip 12 and a substrate layer 20 which is directly formed on an active surface 14 of the semiconductor chip 12. The substrate layer 20 includes two dielectric layers 15, 16 and a plurality of conductive traces 18. The dielectric layer 15 is disposed on the active surface 14 of the semiconductor chip 12. The conductive traces 18 are formed on the dielectric layer 15 and are electrically connected to a plurality of pads which are disposed on the active surface 14 of the semiconductor chip 12. The dielectric layer 16 is disposed on the dielectric layer 15 and the conductive traces 18, and part of the conductive traces 18 are exposes out of the dielectric layer 16 so as to form a plurality of contacts. A plurality of solder balls 24 or conductive leads are disposed on the contacts for electrically connecting to an exterior device (not shown), e.g. a printed circuit board. A solder mask 26 is disposed on the dielectric layer 16 for surrounding the contacts 24. However, much higher packaging density of a semiconductor package is still an object to achieve minimization of the entire semiconductor package. In addition, the conventional Chip Size Package 2 cannot efficiently solve a problem that the passive components are disposed in an extra space and on an extra area. In other words, the semiconductor package must be provided with an extra space and on an extra area for receiving the passive components.

Accordingly, there exists a need for a semiconductor package capable of having higher packaging density of an integrated circuit.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a semiconductor package including substrate layers and having much higher packaging density of integrated circuit so as to achieve the minimization of the entire semiconductor package.

In order to achieve the foregoing objects, the present invention provides a semiconductor package including a semiconductor chip, a first substrate layer and a second substrate layer. The semiconductor chip has an active surface and a plurality of pads disposed on the active surface. The first substrate layer is formed on the active surface of the semiconductor chip and has a plurality of first contacts electrically connected to the pads of the semiconductor chip. The second substrate layer formed on the first substrate layer is substantially smaller than the first substrate layer, and has a plurality of second contacts electrically connected to the first contacts of the first substrate layer.

The semiconductor package of the present invention utilizes the Redistribution Layer (RDL) manufacturing process and the Build-up manufacturing process to form two substrate layers. The two substrate layers have different size and further define a cavity or a shoulder for receiving one or more second semiconductor chips and passive components. Furthermore, the semiconductor package according to the present invention can be directly installed on the printed circuit board without an intermediate carrier. Furthermore, the semiconductor package according to the present invention has much higher packaging density of integrated circuit so as to achieve an object of the minimization of the entire semiconductor package.

The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional schematic view of a chip size package in the prior art.

FIG. 2 a is a sectional schematic view of a semiconductor package according to an embodiment of the present invention.

FIG. 2 b is a plane schematic view of a semiconductor package according to an embodiment of the present invention.

FIG. 3 is a sectional schematic view of a semiconductor package according to an embodiment of the present invention and an exterior device.

FIGS. 4 to 10 are sectional schematic views of a method for manufacturing a semiconductor package of the present invention.

FIG. 11 is a sectional schematic view of a semiconductor package according to another embodiment of the present invention.

FIG. 12 is a sectional schematic view of a semiconductor package according to a further embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 2 a and 2 b, they depict a semiconductor package 100 according to an embodiment of the present invention. The semiconductor package 100 includes a first semiconductor chip 110 which has a plurality of pads 112 disposed on an active surface 114 of the first semiconductor chip 110. A substrate layer 120 is formed on the active surface 114 of the first semiconductor chip 110. An annular substrate layer 150 is formed on the substrate layer 120 for defining a cavity 159 on the substrate layer 120.

The substrate layer 120 and the annular substrate layer 150 respectively include at least one dielectric layer (described in the following article), a plurality of conductive traces (described in the following article) and a plurality of contacts 142, 152. The contacts 142 are electrically connected to the pads 112 through the conductive traces, and the contacts 152 are electrically connected to the contacts 142 through the conductive traces.

At least one second semiconductor chip 160, e.g. two second semiconductor chips 160 a, 160 b, are parallel disposed on the substrate layer 120, and at least one passive component 164, e.g. two passive components 164 a, 164 b, are disposed on the substrate layer 120, and the second semiconductor chip 160 and the passive component 164 are located in the cavity 159 of the annular substrate layer 150. The second semiconductor chip 160 can be electrically connected to the contacts 142 by means of a flip chip connection technology, and the passive component 164 is electrically connected to the contacts 142. A heat spreader 170 or a heat sink can adhere to a back surface 116 of the first semiconductor chip 110. A plurality of exterior contacts, e.g. conductive leads or solder balls 153, are disposed on the contacts 152 of the annular substrate layer 150 for electrically connecting to an exterior device 180, e.g. a printed circuit board, such that the semiconductor package 100 can be installed on the exterior device 180, shown in FIG. 3.

The present invention provides a method for manufacturing the above-mentioned semiconductor package 100 by utilizing a Redistribution Layer (RDL) manufacturing process and a Build-up manufacturing process. Referring FIG. 4 to FIG. 9, they depict a method for manufacturing the above-mentioned semiconductor package 100 according to the present invention.

Referring to FIG. 4, a semiconductor wafer 102 includes a plurality of first semiconductor chips 110, and each first semiconductor chip 110 has a plurality of pads 112 which are disposed on an active surface 114 of the semiconductor wafer 102. A dielectric layer 122 is formed on an active surface 114 of the semiconductor wafer 102.

Referring to FIG. 5, a plurality of openings 124 are formed in the dielectric layer 122 by means of light reaction or laser manufacturing process, such that the pads 112 of the first semiconductor chip 110 are exposed out of the openings 124 of the dielectric layer 122. A conductive metal layer 126 is formed on the dielectric layer 122 and the pads 112 by means of electroplating or deposition mode. According to an embodiment of the present invention, a seeded metal layer is formed on the dielectric layer 122 and the pads 112 in advance, and then the thickness of the seeded metal layer is thickened to a predetermined thickness by means of electroplating mode, thereby forming the conductive metal layer 126. The opening 124 preferably has a profile of a wide upper portion and a narrow lower portion for facilitating to electroplate the conductive metal layer 126 on the interior of the opening 124 and the pads 112. According to an embodiment of the present invention, the conductive metal layer 126 can be fully electroplated or filled in the opening 124 and on the dielectric layer 122. Then, a plurality of conductive traces 128 are formed on the dielectric layer 122 and the pads 112 by selectively etching the conductive metal layer 126.

Referring to FIG. 6, another dielectric layer 130 is formed on the dielectric layer 122 and the conductive traces 128. A plurality of openings 132 are formed in the dielectric layer 130 by means of light reaction or laser manufacturing process, such that parts of the conductive traces 128 are exposed out of the openings 132 of the dielectric layer 130. A conductive metal layer 134 is formed on the dielectric layer 130 and the parts of the conductive traces 128 by means of electroplating or deposition mode. Then, a plurality of conductive traces 136 are formed on the dielectric layer 130 and the parts of the conductive traces 128 by selectively etching the conductive metal layer 134.

Referring to FIG. 7, a dielectric layer 138 is formed on the dielectric layer 130 and the conductive traces 136. A plurality of openings 140 are formed in the dielectric layer 138 by means of light reaction or laser manufacturing process, such that the parts of the conductive traces 136 are exposed out of the openings 140 of the dielectric layer 138, thereby forming a plurality of contacts 142.

Referring to FIG. 8, an annular substrate layer 150, e.g. rectangle or circular shape, is formed on the substrate layer 120 for defining a cavity 159 on the substrate layer 120. The manufacturing process of the annular substrate layer 150 is similar to that of the substrate layer 120. A plurality of contacts 152 are formed on the annular substrate layer 150 and are electrically connected to the contacts 142 of the substrate layer 120.

It is apparent to one of ordinary skill in the art that the above-mentioned that the substrate layer 120 and the annular substrate layer 150 are manufactured by means of a build-up manufacturing process. However, the manufacturing method of the substrate layer 120 and the annular substrate layer 150 is not limited to the build-up manufacturing process, and the manufacturing method can be a lamination manufacturing process as well.

Referring to FIG. 9, the annular substrate layer 150 defines the cavity 159 on the substrate layer 120. A second semiconductor chip 160 and a passive component 164 are disposed on the substrate layer 120 and in the cavity 159 of the annular substrate layer 150. The second semiconductor chip 160 can be electrically connected to the contacts 142 of the substrate layer 120 through a plurality of bumps 162 by means of a flip chip connection technology, and an underfill 163 (such as epoxy) is disposed between the second semiconductor chip 160 and the substrate layer 120. It is apparent to one of ordinary skill in the art that the second semiconductor chip 160 can be electrically connected to the substrate layer 120 by means of a wire bonding connection technology and a molding compound is fully filled in the cavity 159 of the annular substrate layer 150 for encapsulating the second semiconductor chip 160.

In addition, the semiconductor package 100 further includes a plurality of second semiconductor chips 160 are stacked or parallel disposed on the substrate layer 120. It is apparent to one of ordinary skill in the art that the second semiconductor chips 160 can be electrically connected to the substrate layer 120 by means of a flip chip connection or a wire bonding connection technology. A plurality of solder balls 153 are formed on the contacts 152 of the annular substrate layer 150 for electrically connecting to an exterior device (not shown), e.g. a printed circuit board.

It is apparent to one of ordinary skill in the art that the thickness of the annular substrate layer 150 is larger than the height of the second semiconductor chip 160 and the passive component 164 so as to avoid the interference between the second semiconductor chip 160 (and the passive component 164) and a printed circuit board when the semiconductor 100 is installed on the printed circuit board, shown in FIG. 3.

Referring to FIG. 10, the semiconductor wafer 102 is cut by means of a cutting device 166 for separating each first semiconductor chip 110 from one another, thereby forming the plurality of semiconductor package 100.

As shown in FIG. 2, a plurality of heat spreader 170 can adhere to a back surface 116 of the first semiconductor chip 110 for dissipating heat before the semiconductor wafer 102 is cut.

The method for manufacturing the semiconductor package according to the present invention utilizes a wafer level manufacturing process to dispose the second semiconductor chip and the passive component, and therefore it substantially decrease the manufacturing time of the semiconductor package.

Referring to FIG. 11, it depicts a semiconductor package 200 according to another embodiment of the present invention. The semiconductor package 200 is substantially similar to the semiconductor package 100 wherein the similar elements are designated with the similar reference numerals. The semiconductor package 200 includes a first semiconductor chip 210 which has a plurality of pads 212 disposed on an active surface 214 of the first semiconductor chip 210. A substrate layer 220 is formed on the active surface 214 of the first semiconductor chip 210. An annular substrate layer 250 is formed on the substrate layer 220. The substrate layer 220 and the annular substrate layer 250 respectively include at least one dielectric layer (not shown), a plurality of conductive traces (not shown) and a plurality of contacts 242, 252. The contacts 242 are connected to the pads 212 through the conductive traces, and the contacts 252 are electrically connected to the contacts 242 through the conductive traces. Two second semiconductor chips 260, 261 and a passive component 264 are disposed on the substrate layer 220, and are located in a cavity surround by the annular substrate layer 250. The second semiconductor chip 260 can be electrically connected to the contacts 242 by means of a flip chip connection technology. The second semiconductor chip 261 adheres to the second semiconductor chip 260, and the second semiconductor chip 261 can be electrically connected to the contacts 242 by means of a wire bonding connection technology. The passive component 264 is electrically connected to the contacts 242. The cavity of the annular substrate layer 250 is filled with a molding compound 268 for encapsulating the second semiconductor chip 260, 261 and the passive component 264. A heat spreader 270 or a heat sink can adhere to a back surface 216 of the first semiconductor chip 210. A plurality of exterior contacts, e.g. conductive leads or solder balls 253, are disposed on the contacts 252 of the annular substrate layer 250 for electrically connecting to an exterior device (not shown).

Referring to FIG. 12, it depicts a semiconductor package 300 according to a further embodiment of the present invention. The semiconductor package 300 is substantially similar to the semiconductor package 100 wherein the similar elements are designated with the similar reference numerals. The semiconductor package 300 includes a first semiconductor chip 310 which has a plurality of pads 312 disposed on an active surface 314 of the first semiconductor chip 310. A substrate layer 320 is formed on the active surface 314 of the first semiconductor chip 310. A substrate layer 350, e.g. a rectangle shape, is formed on the substrate layer 320, and the size of the substrate layer 350 is substantially bigger than the size of the substrate layer 320 for forming a shoulder 359 on the substrate layer 320. The shoulder 359 can be an annular area. The substrate layers 320, 250 respectively include at least one dielectric layer (not shown), a plurality of conductive traces (not shown) and a plurality of contacts 342, 352. The contacts 342 are connected to the pads 312 through the conductive traces, and the contacts 352 are electrically connected to the contacts 342 through the conductive traces. A second semiconductor chip 360 and a passive component 364 are disposed on the shoulder 359. The second semiconductor chip 360 can be electrically connected to the contacts 342 by means of a flip chip connection technology, and the passive component 364 is electrically connected to the contacts 342. A heat spreader 370 or a heat sink can adhere to a back surface 316 of the first semiconductor chip 310. A plurality of exterior contacts, e.g. conductive leads or solder balls 353, are disposed on the contacts 352 of the substrate layer 350 for electrically connecting to an exterior device (not shown).

A method for manufacturing the semiconductor package of the present invention utilizes the Redistribution Layer (RDL) manufacturing process and the Build-up manufacturing process to form two substrate layers. The two substrate layers have different size and further define a cavity or a shoulder for receiving one or more second semiconductor chips and passive components. Furthermore, the semiconductor package according to the present invention can be directly installed on the printed circuit board without an intermediate carrier. Furthermore, the semiconductor package according to the present invention has much higher packaging density of integrated circuit so as to achieve an object of the minimization of the entire semiconductor package. It is apparent to one of ordinary skill in the art that the semiconductor package according to the present invention can be applied in the filed of Plastic Ball Grid Array (PBGA), Heat Slug Ball Grid Array (HSBGA), Cavity Down Ball Grid Array, Chip Size Package Ball Grid Array (CSP BGA), Thin Fine Pitch Ball Grid Array (TFBGA), Low Fine Pitch Ball Grid Array (LFBGA) and Very Fine Pitch Ball Grid Array (VFBGA).

Although the invention has been explained in relation to its preferred embodiment, it is not used to limit the invention. It is to be understood that many other possible modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention as hereinafter claimed. 

1. A semiconductor package comprising: a first semiconductor chip having an active surface, a back surface and a plurality of pads disposed on the active surface; a first substrate layer formed on the active surface of the first semiconductor chip and comprising a plurality of first contacts electrically connected to the pads; and a second substrate layer formed on the first substrate layer and comprising a plurality of second contacts electrically connected to the first contacts.
 2. The semiconductor package as claimed in claim 1, wherein the first substrate layer further comprises at least one first dielectric layer and a plurality of first conductive traces disposed on the first dielectric layer for electrically connecting the first contacts to the pads.
 3. The semiconductor package as claimed in claim 1, wherein the second substrate layer further comprises at least one second dielectric layer and a plurality of second conductive traces disposed on the second dielectric layer for electrically connecting the second contacts to the first contacts.
 4. The semiconductor package as claimed in claim 1, wherein the second substrate layer is annular shape for defining a cavity on the first substrate layer; and the semiconductor package further comprises at least one second semiconductor chip disposed on the first substrate layer and located in the cavity.
 5. The semiconductor package as claimed in claim 4, further comprising: a plurality of second semiconductor chips stacked on the first substrate layer and located in the cavity.
 6. The semiconductor package as claimed in claim 4, further comprising: a plurality of second semiconductor chips parallel disposed on the first substrate layer and located in the cavity.
 7. The semiconductor package as claimed in claim 4, wherein the second semiconductor chip is electrically connected to the first contacts by means of a flip chip connection technology.
 8. The semiconductor package as claimed in claim 7, further comprising: an underfill disposed between the second semiconductor chip and the first substrate layer.
 9. The semiconductor package as claimed in claim 4, wherein the second semiconductor chip is electrically connected to the first contacts by means of a wire bonding connection technology.
 10. The semiconductor package as claimed in claim 9, further comprising: a molding compound filling in the cavity.
 11. The semiconductor package as claimed in claim 4, further comprising: at least one passive component disposed on the first substrate layer and located in the cavity.
 12. The semiconductor package as claimed in claim 1, wherein the second substrate layer has a shoulder formed on the first substrate layer; and the semiconductor package further comprises at least one second semiconductor chip disposed on the shoulder.
 13. The semiconductor package as claimed in claim 12, further comprising: a plurality of second semiconductor chips stacked on the shoulder.
 14. The semiconductor package as claimed in claim 12, further comprising: a plurality of second semiconductor chips parallel disposed on the shoulder.
 15. The semiconductor package as claimed in claim 12, further comprising: a molding compound encapsulating the second semiconductor chip.
 16. The semiconductor package as claimed in claim 12, further comprising: at least one passive component disposed on the shoulder.
 17. The semiconductor package as claimed in claim 1, further comprising: a heat spreader adhering to the back surface of the first semiconductor chip.
 18. The semiconductor package as claimed in claim 1, further comprising: a plurality of exterior contacts disposed on the contacts of the second substrate layer for electrically connecting to a circuit device.
 19. A method for manufacturing a semiconductor package, comprising the steps of: providing a semiconductor wafer comprising a plurality of first semiconductor chips, wherein each first semiconductor chip has an active surface and a plurality of pads disposed on the active surface of the semiconductor wafer; forming a first substrate layer on the first semiconductor chip, wherein the first substrate layer comprises a plurality of first contacts electrically connected to the pads; forming a second substrate layer on the first substrate layer, wherein the second substrate layer comprises a plurality of second contacts electrically connected to the first contacts and the second substrate layer is smaller than the first substrate layer; and cutting the semiconductor wafer so as to form the individual semiconductor package.
 20. The method for manufacturing a semiconductor package as claimed in claim 19, wherein the step of forming the first substrate layer on the first semiconductor chip comprises the steps of: forming a first dielectric layer on the active surface of the semiconductor wafer; forming a plurality of first openings in the first dielectric layer, such that the pads of the first semiconductor chip are exposed out of the first dielectric layer; forming a conductive metal layer on the first dielectric layer and the pads exposed out of the first openings by means of electroplating or deposition mode; forming a plurality of conductive traces on the first dielectric layer and the pads exposed out of the first openings by selectively etching the conductive metal layer; forming a second dielectric layer on the first dielectric layer and the conductive traces; forming a plurality of second openings in the second dielectric layer, such that parts of the conductive traces are exposed out of the second dielectric layer; and forming a plurality of the first contacts on the parts of the conductive traces exposed out of the second dielectric layer.
 21. The method for manufacturing a semiconductor package as claimed in claim 19, wherein the step of forming a second substrate layer on the first substrate layer comprises the steps of: forming a third dielectric layer on the first substrate layer; forming a plurality of third openings in the third dielectric layer, such that the first contacts of the first substrate layer are exposed out of the third dielectric layer; forming a conductive metal layer on the third dielectric layer and the first contacts exposed out of the third openings by means of electroplating or deposition mode; forming a plurality of conductive traces on the third dielectric layer and the first contacts exposed out of the third openings by selectively etching the conductive metal layer; forming a fourth dielectric layer on the third dielectric layer and the conductive traces; forming a plurality of fourth openings in the fourth dielectric layer, such that parts of the conductive traces are exposed out of the fourth dielectric layer; and forming the second contacts on the parts of the conductive traces exposed out of the fourth dielectric layer.
 22. The method for manufacturing a semiconductor package as claimed in claim 19, wherein the second substrate layer is annular shape for defining a cavity on the first substrate layer; and the method for manufacturing a semiconductor package further comprises the step of: disposing at least one second semiconductor chip on the first substrate layer, wherein the second semiconductor chip is located in the cavity.
 23. The method for manufacturing a semiconductor package as claimed in claim 22, further comprising the step of: disposing at least one passive component on the first substrate layer and located in the cavity.
 24. The method for manufacturing a semiconductor package as claimed in claim 19, wherein the second substrate layer has a shoulder formed on the first substrate layer; and the method for manufacturing a semiconductor package further comprises the step of: disposing at least one second semiconductor chip on the shoulder.
 25. The method for manufacturing a semiconductor package as claimed in claim 24, further comprising the step of: disposing at least one passive component on the shoulder.
 26. The method for manufacturing a semiconductor package as claimed in claim 19, further comprising the step of: adhering a heat spreader to the first semiconductor chip.
 27. The method for manufacturing a semiconductor package as claimed in claim 19, further comprising the step of: disposing a plurality of exterior contacts on the second contacts of the second substrate layer for electrically connecting to a circuit device. 